4. Predator drone

Drones are the ultimate in impersonal conflict. These weapons require virtually no human involvement, travel hundreds of miles and are controlled from extremely safe locations. Officially, they are used only for reconnaissance and intelligence gathering missions. Their greatest impact has been their ability to provide incredibly detailed, accurate and up-to-date information to enable successful strategy planning. It helps minimize resource wastage, and is vital in the concept of surgical strikes, reducing collateral damage and civilian casualties. It also reduces military casualties, as drones are sometimes fitted with hellfire missiles, which can do a lot of damage without risking close engagement with the enemy.